<template>
  <div class="detail">
    <Header />
    <div class="main">
      <div class="course-info">
        <div class="wrap-left">
          <vue3-video-player
            v-if="course.info.course_video"
            @play="onPlay($event)"
            @pause="onPause($event)"
            :cover="course.info.course_cover"
            :src="course.info.course_video"
          ></vue3-video-player>
          <img :src="course.info.course_cover" style="width: 100%" alt v-else />
        </div>
        <div class="wrap-right">
          <h3 class="course-name">{{ course.info.name }}</h3>
          <p class="data">
            {{
              course.info.students
            }}人在学&nbsp;&nbsp;&nbsp;&nbsp;课程总时长：{{
              course.info.pub_lessons
            }}课时/{{ course.info.lessons }}&nbsp;&nbsp;&nbsp;&nbsp;难度：{{
              course.info.get_level_display
            }}
          </p>
          <div class="sale-time" v-if="course.info.discount.type">
            <p class="sale-type">{{ course.info.discount.type }}</p>
            <p class="expire" v-if="course.info.discount.expire > 0">
              {{ parseInt(course.info.discount.expire / 86400) }}天
              {{
                fill0(parseInt((course.info.discount.expire / 3600) % 24))
              }}小时
              {{ fill0(parseInt((course.info.discount.expire / 60) % 60)) }}分
              <span class="second">
                {{ fill0(parseInt(course.info.discount.expire % 60)) }}
              </span>
              秒
            </p>
          </div>
          <div class="sale-time" v-if="!course.info.discount.type">
            <p class="sale-type">
              课程价格 ¥{{ parseFloat(course.info.price).toFixed(2) }}
            </p>
          </div>
          <p class="course-price" v-if="course.info.discount.price >= 0">
            <span>活动价</span>
            <span class="discount"
              >¥{{ parseFloat(course.info.discount.price).toFixed(2) }}</span
            >
            <span class="original"
              >¥{{ parseFloat(course.info.price).toFixed(2) }}</span
            >
          </p>
          <p class="course-price" v-if="course.info.credit > 0">
            <span>抵扣积分</span>
            <span class="discount">{{ course.info.credit }}</span>
          </p>
          <div class="buy">
            <div class="buy-btn">
              <button class="buy-now">立即购买</button>
              <button class="free">免费试学</button>
            </div>
            <el-popconfirm
              title="您确认添加当前课程加入购物车吗？"
              @confirm="add_cart"
              confirmButtonText="买买买！"
              cancelButtonText="误操作！"
            >
              <template #reference>
                <div class="add-cart">
                  <img src="../assets/cart-yellow.svg" alt="" />加入购物车
                </div>
              </template>
            </el-popconfirm>
          </div>
        </div>
      </div>
      <div class="course-tab">
        <ul class="tab-list">
          <li
            :class="state.tabIndex === 1 ? 'active' : ''"
            @click="state.tabIndex = 1"
          >
            详情介绍
          </li>
          <li
            :class="state.tabIndex === 2 ? 'active' : ''"
            @click="state.tabIndex = 2"
          >
            课程章节
            <span
              :class="state.tabIndex !== 2 ? 'free' : ''"
              v-if="course?.info?.can_free_study"
              >(试学)</span
            >
          </li>
          <li
            :class="state.tabIndex === 3 ? 'active' : ''"
            @click="state.tabIndex = 3"
          >
            用户评论 (42)
          </li>
          <li
            :class="state.tabIndex === 4 ? 'active' : ''"
            @click="state.tabIndex = 4"
          >
            常见问题
          </li>
        </ul>
      </div>
      <div class="course-content">
        <div class="course-tab-list">
          <div
            class="tab-item"
            v-if="state.tabIndex === 1"
            v-html="course.info.description"
          ></div>
          <div class="tab-item" v-if="state.tabIndex === 2">
            <div class="tab-item-title">
              <p class="chapter">课程章节</p>
              <p class="chapter-length">
                共{{ course?.info?.chapter_list?.length }}章
                {{ course.info.lessons }}个课时
              </p>
            </div>
            <div
              class="chapter-item"
              v-for="(chapter, key) in course?.info?.chapter_list"
              :key="key"
            >
              <p class="chapter-title">
                <img src="../assets/1.svg" alt="" />
                第{{ chapter.orders }}章·{{ chapter.name }}
              </p>
              <div
                class="chapter-title"
                style="padding-left: 2.4rem"
                v-if="chapter.summary"
                v-html="chapter.summary"
              ></div>
              <ul class="lesson-list">
                <li
                  class="lesson-item"
                  v-for="(lesson, key) in chapter.lesson_list"
                  :key="key"
                >
                  <p class="name">
                    <span class="index"
                      >{{ chapter.orders }}-{{ lesson.orders }}</span
                    >
                    {{ lesson.name }}
                    <span class="free" v-if="lesson.free_trail">免费</span>
                  </p>
                  <p class="time">
                    {{ lesson.duration }}
                    <img src="../assets/chapter-player.svg" />
                  </p>
                  <button class="try" v-if="lesson.free_trail">立即试学</button>
                  <button class="try" v-else>购买课程</button>
                </li>
              </ul>
            </div>
          </div>
          <div class="tab-item" v-if="state.tabIndex === 3">用户评论</div>
          <div class="tab-item" v-if="state.tabIndex === 4">常见问题</div>
        </div>
        <div class="course-side">
          <div class="teacher-info">
            <h4 class="side-title">
              <span>授课老师</span>
            </h4>
            <div class="teacher-content">
              <div class="cont1">
                <img :src="course.info.teacher.avatar" />
                <div class="name">
                  <p class="teacher-name">{{ course.info.teacher.name }}</p>
                  <p class="teacher-title">
                    {{ course.info.teacher.get_role_display }},{{
                      course.info.teacher.title
                    }}
                  </p>
                </div>
              </div>
              <div class="narrative" v-html="course.info.teacher.brief"></div>
            </div>
          </div>
        </div>
      </div>
    </div>
    <Footer />
  </div>
</template>

<script setup>
import { reactive, ref, watch } from "vue";
import { useRoute } from "vue-router";
import Header from "../components/Header.vue";
import Footer from "../components/Footer.vue";
import router from "../router";
import { ElMessage } from "element-plus";
import course from "../api/course";
import { fill0 } from "../utils/func";
import cart from "../api/cart";
import { useStore } from "vuex";

let route = useRoute();
const store = useStore();

const state = reactive({
  course_id: route.params.id,
  tabIndex: 2,
});

// 获取地址上的课程id
course.course_id = route.params.id;
if (course.course_id > 0) {
  course
    .get_course_info()
    .then((res) => {
      course.info = res.data;
      // 针对优惠课程如果有优惠时间，则进行倒计时处理
      clearInterval(course.timer);
      course.timer = setInterval(() => {
        if (course.info.discount.expire && course.info.discount.expire > 0) {
          course.info.discount.expire--;
        }
      }, 1000);
    })
    .catch((err) => {
      ElMessage.error({
        message: "无效的课程ID！",
        duration: 1000,
        onClose() {
          router.go(-1);
        },
      });
    });
} else {
  ElMessage.error({
    message: "无效的课程ID！",
    duration: 1000,
    onClose() {
      router.go(-1);
    },
  });
}

// 添加课程到购物车
// 详情页中添加商品到购物车，不用传递参数，直接使用course来获取课程信息
const add_cart = () => {
  let token = sessionStorage.token || localStorage.token;
  cart
    .add_course_to_cart(course.course_id, token)
    .then((response) => {
      ElMessage.success(response?.data?.errmsg);
      store.commit("set_cart_total", response.data.cart_total);
    })
    .catch((error) => {
      if (error?.response?.status === 401) {
        store.commit("logout");
        ElMessage.error("您尚未登录或已登录超时，请登录后继续操作！");
      } else {
        ElMessage.error(
          `添加商品到购物车失败:${error?.response?.data?.errmsg}`
        );
      }
    });
};

// 播放器开始播放视频的回调函数
let onPlay = (event) => {
  console.log("播放");
  console.log(event);
  console.log(event.target.currentTime); // 当前播放的视频时间进度，可以用于跟踪播放视频的视频
  console.log(event.target.duration); // 当前视频的总时长，可以用于跟踪播放视频的视频
};

// 播放器暂停播放视频的回调函数
let onPause = (event) => {
  console.log("暂停");
  console.log(event.target.currentTime); // 当前播放的视频时间进度，可以用于跟踪播放视频的视频
  console.log(event.target.duration); // 当前视频的总时长，可以用于跟踪播放视频的视频
};
</script>

<style scoped>
.main {
  background: #fff;
  padding-top: 30px;
}
.course-info {
  width: 1200px;
  margin: 0 auto;
  overflow: hidden;
}
.wrap-left {
  float: left;
  width: 690px;
  height: 388px;
  background-color: #000;
}
.wrap-right {
  float: left;
  position: relative;
  height: 388px;
}
.course-name {
  font-size: 20px;
  color: #333;
  padding: 10px 23px;
  letter-spacing: 0.45px;
}
.data {
  padding-left: 23px;
  padding-right: 23px;
  padding-bottom: 16px;
  font-size: 14px;
  color: #9b9b9b;
}
.sale-time {
  width: 464px;
  background: #fa6240;
  font-size: 14px;
  color: #4a4a4a;
  padding: 10px 23px;
  overflow: hidden;
}
.sale-type {
  font-size: 16px;
  color: #fff;
  letter-spacing: 0.36px;
  float: left;
}
.sale-time .expire {
  font-size: 14px;
  color: #fff;
  float: right;
}
.sale-time .expire .second {
  width: 24px;
  display: inline-block;
  background: #fafafa;
  color: #5e5e5e;
  padding: 6px 0;
  text-align: center;
}
.course-price {
  background: #fff;
  font-size: 14px;
  color: #4a4a4a;
  padding: 5px 23px;
}
.discount {
  font-size: 26px;
  color: #fa6240;
  margin-left: 10px;
  display: inline-block;
  margin-bottom: -5px;
}
.original {
  font-size: 14px;
  color: #9b9b9b;
  margin-left: 10px;
  text-decoration: line-through;
}
.buy {
  width: 464px;
  padding: 0px 23px;
  position: absolute;
  left: 0;
  bottom: 20px;
  overflow: hidden;
}
.buy .buy-btn {
  float: left;
}
.buy .buy-now {
  width: 125px;
  height: 40px;
  border: 0;
  background: #ffc210;
  border-radius: 4px;
  color: #fff;
  cursor: pointer;
  margin-right: 15px;
  outline: none;
}
.buy .free {
  width: 125px;
  height: 40px;
  border-radius: 4px;
  cursor: pointer;
  margin-right: 15px;
  background: #fff;
  color: #ffc210;
  border: 1px solid #ffc210;
}
.add-cart {
  float: right;
  font-size: 14px;
  color: #ffc210;
  text-align: center;
  cursor: pointer;
  margin-top: 10px;
}
.add-cart img {
  width: 20px;
  height: 18px;
  margin-right: 7px;
  vertical-align: middle;
}

.course-tab {
  width: 100%;
  background: #fff;
  margin-bottom: 30px;
  box-shadow: 0 2px 4px 0 #f0f0f0;
}
.course-tab .tab-list {
  width: 1200px;
  margin: auto;
  color: #4a4a4a;
  overflow: hidden;
}
.tab-list li {
  float: left;
  margin-right: 15px;
  padding: 26px 20px 16px;
  font-size: 17px;
  cursor: pointer;
}
.tab-list .active {
  color: #ffc210;
  border-bottom: 2px solid #ffc210;
}
.tab-list .free {
  color: #fb7c55;
}
.course-content {
  width: 1200px;
  margin: 0 auto;
  background: #fafafa;
  overflow: hidden;
  padding-bottom: 40px;
}
.course-tab-list {
  width: 880px;
  height: auto;
  padding: 20px;
  background: #fff;
  float: left;
  box-sizing: border-box;
  overflow: hidden;
  position: relative;
  box-shadow: 0 2px 4px 0 #f0f0f0;
}
.tab-item {
  width: 880px;
  background: #fff;
  padding-bottom: 20px;
  box-shadow: 0 2px 4px 0 #f0f0f0;
}
.tab-item-title {
  justify-content: space-between;
  padding: 25px 20px 11px;
  border-radius: 4px;
  margin-bottom: 20px;
  border-bottom: 1px solid #333;
  border-bottom-color: rgba(51, 51, 51, 0.05);
  overflow: hidden;
}
.chapter {
  font-size: 17px;
  color: #4a4a4a;
  float: left;
}
.chapter-length {
  float: right;
  font-size: 14px;
  color: #9b9b9b;
  letter-spacing: 0.19px;
}
.chapter-title {
  font-size: 16px;
  color: #4a4a4a;
  letter-spacing: 0.26px;
  padding: 12px;
  background: #eee;
  border-radius: 2px;
  display: -ms-flexbox;
  display: flex;
  -ms-flex-align: center;
  align-items: center;
}
.chapter-title img {
  width: 18px;
  height: 18px;
  margin-right: 7px;
  vertical-align: middle;
}
.lesson-list {
  padding: 0 20px;
}
.lesson-list .lesson-item {
  padding: 15px 20px 15px 36px;
  cursor: pointer;
  justify-content: space-between;
  position: relative;
  overflow: hidden;
}
.lesson-item .name {
  font-size: 14px;
  color: #666;
  float: left;
}
.lesson-item .index {
  margin-right: 5px;
}
.lesson-item .free {
  font-size: 12px;
  color: #fff;
  letter-spacing: 0.19px;
  background: #ffc210;
  border-radius: 100px;
  padding: 1px 9px;
  margin-left: 10px;
}
.lesson-item .time {
  font-size: 14px;
  color: #666;
  letter-spacing: 0.23px;
  opacity: 1;
  transition: all 0.15s ease-in-out;
  float: right;
}
.lesson-item .time img {
  width: 18px;
  height: 18px;
  margin-left: 15px;
  vertical-align: text-bottom;
}
.lesson-item .try {
  width: 86px;
  height: 28px;
  background: #ffc210;
  border-radius: 4px;
  font-size: 14px;
  color: #fff;
  position: absolute;
  right: 20px;
  top: 10px;
  opacity: 0;
  transition: all 0.2s ease-in-out;
  cursor: pointer;
  outline: none;
  border: none;
}
.lesson-item:hover {
  background: #fcf7ef;
  box-shadow: 0 0 0 0 #f3f3f3;
}
.lesson-item:hover .name {
  color: #333;
}
.lesson-item:hover .try {
  opacity: 1;
}

.course-side {
  width: 300px;
  height: auto;
  margin-left: 20px;
  float: right;
}
.teacher-info {
  background: #fff;
  margin-bottom: 20px;
  box-shadow: 0 2px 4px 0 #f0f0f0;
}
.side-title {
  font-weight: normal;
  font-size: 17px;
  color: #4a4a4a;
  padding: 18px 14px;
  border-bottom: 1px solid #333;
  border-bottom-color: rgba(51, 51, 51, 0.05);
}
.side-title span {
  display: inline-block;
  border-left: 2px solid #ffc210;
  padding-left: 12px;
}

.teacher-content {
  padding: 30px 20px;
  box-sizing: border-box;
}

.teacher-content .cont1 {
  margin-bottom: 12px;
  overflow: hidden;
}

.teacher-content .cont1 img {
  width: 54px;
  height: 54px;
  margin-right: 12px;
  float: left;
}
.teacher-content .cont1 .name {
  float: right;
}
.teacher-content .cont1 .teacher-name {
  width: 188px;
  font-size: 16px;
  color: #4a4a4a;
  padding-bottom: 4px;
}
.teacher-content .cont1 .teacher-title {
  width: 188px;
  font-size: 13px;
  color: #9b9b9b;
  white-space: nowrap;
}
.teacher-content .narrative {
  font-size: 14px;
  color: #666;
  line-height: 24px;
}
</style>
